SESAM USER MANUAL. GeniE Tutorial. Semi Pontoon Workshop SAFER, SMARTER, GREENER

SESAM USER MANUAL GeniE Tutorial Semi Pontoon Workshop SAFER, SMARTER, GREENER

Sesam User Manual GeniE Tutorial Semi Pontoon Workshop Date: 29 January 2015 Valid from GeniE V7.0 Prepared by DNV GL - Software E-mail support: software.support@dnvgl.com E-mail sales: software@dnvgl.com DNV GL AS. All rights reserved This publication or parts thereof may not be reproduced or transmitted in any form or by any means, including copying or recording, without the prior written consent of DNV GL AS.

Part 0 - General SESAM User Course in Curved Structure Modelling Genie Workshop: Modelling pontoon and lower column The purpose of this workshop is to create a model intended for both hydrostatic, hydrodynamic and stress analysis. The workshop does not document how to do the actual analyses; the focus is on how to create the model. The structure and loads are fictitious, but you will learn the necessary modelling tasks to make a real structure The following topics are covered: Flat and curved plates Regular and curved beams Boundary conditions Finite element mesh control It is assumed that the user is familiar with structure modelling (beams and plates using snap to point modelling techniques). Furthermore, it is required that the user has basic knowledge on GeniE s user interface and how the user may interact with the model to derive necessary information (such as length, positions, properties, display settings and so on). Detailed guidance is given in the beginning of the tutorial The workshop is also accompanied with input files for GeniE (Journal file) You need to make mesh and run analysis to see results This workshop should be viewed on-line or on colour print out. All pictures have been created using paper background Default viewing settings have been modified This tutorial has been revised with GeniE version V6.4 Your PC should have at least 1 GB RAM and preferably hardware acceleration supporting OpenGL Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 3

Part 0 - General Main dimensions The main dimensions are as shown below. Notice that detailed dimensions are not given; they are documented during the workshop. y x Emphasis has also been put on using different type of commands so that you learn alternative methods for the various tasks you want to do As a consequence an operation documented herein may be more efficient by using other commands Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 4

Part 0 General Part 0 General introduction to the workshop Pages 1-4 Part 1 Design premise Define the units, material and section types Pages 5-10 Part 2 Outer hull, regular part one quadrant Define the regular and parallel part of the pontoon You will se the symbols to the right that represent start and stop of beams during modelling. Notice that the symbol for right mouse bottom click is different from left mouse bottom click Pages 11-13 Part 3 Outer hull, transition one quadrant Model the transition part between regular and fore part Pages 14-21 Part 4 Make the fore part Create the fore front of the pontoon Pages 22 22 Part 5 Web frames Insert the web frames Pages 23 27 Part 6 The column Define the column including one horizontal deck Pages 28 35 Part 7 Pontoon stiffeners Insert longitudinal stiffeners Pages 36 41 Part 8 Web frame stiffeners Define the vertical stiffeners Pages 42 45 Part 9 Longitudinal web frame Insert the longitudinal plate and stiffeners Pages 46 46 Part 10 Make named sets Define typical structural parts as sets for later use Pages 47 49 3 1 Click start of beam 2 Click end of beam Use right mouse button to activate the context sensitive menu Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 5

Part 0 General Part 11 Make a mesh Learn how to control the mesh Pages 50-53 Part 12 Make ¼ pontoon Copy the 1/8 pontoon to a ¼ pontoon Pages 54-54 Part 13 Boundary conditions Insert boundary conditions. If you want to make a more complete structure as shown in remaining parts you don t insert boundary conditions at this stage Pages 55-55 Part 14 Make ½ pontoon Copy the ¼ pontoon to a 1/2 pontoon Pages 56-56 Part 15 Make the complete structure Make the complete structure by copying the pontoon and inserting horizontal bracings in between. Pages 57 57 Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 6

Part 1 Design premise Define units meters and N Start the program and open a new workspace File New Workspace. Specify name Semi_pontoon and use the default values for database units. Click OK when done.» Notice, if you want FE results in other units than N and m, you need to change now. Define materials Use the command Edit Properties and select Material. Select Create/Edit Material to give the details for St52 (remember to tick Allow edit ). Set the material type to default and click OK when done Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 7

Part 1 Design premise Define section properties Section profiles Tbar425x120x12x25, Tbar575x150x12x25 and Tbar885x200x14x35 are found from section libraries Use the command Edit Properties and select Section. Select Create/Edit section to start defining the sections. Select Section Library Find the right section library from Browse and select the library tbar (a library containing typical Tbar ship profiles) Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 8

Part 1 Design premise You now find the profiles Tbar425x120x12x25, Tbar575x150x12x25 and Tbar885x200x14x35 The sections are now selected by clicking on Tbar425x120x12x25 and then LMB+click on Tbar575x150x12x25 and Tbar885x200x14x35» The picture below shows the selection of Tbar425x120x12x25 and Tbar575x150x12x25 Click OK and the profiles are now part of the design premise Click create/edit section to modify the imported sections or to insert the remaining brace section Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 9

Part 1 Design premise Define the profiles Brace. You may use mixed units as shown Define the plate thicknesses Pl12, Pl15 and Pl30 as follows: Use the command Edit Properties and select Thickness. Select Create/Edit Thickness to start defining the thickness properties Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 10

Part 1 Design premise The thickness and section properties may now be accessed from the browser. Since the modelling will start with the outer hull, the plate thickness Pl15 should be set as default. Similarly, the first use of stiffeners will be at a outer hull; you should set Tbar885x200x14x35 to defaults. Notice also the default symbol that will appear. Material default has already been set when creating the property 1 Use right mouse button to activate the context sensitive menu 1 Use right mouse button to activate the context sensitive menu Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 11

Part 1 Design premise Specify the mesh settings for automatic mesh creation as follows: Edit Rules Meshing. In addition to default settings tick off for» Use second order elements» Round off Mesh Density Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 12

Part 2 Outer hull, regular part one quadrant Insert a guiding plane from the command Guiding Geometry Planes Guide Plane Dialog and enter the values as shown. Give x-value 0 m, number of spacings 8 in each direction (equal length of all spacings) notice that input may be given in several ways» This plane is used as reference when making the outer hull and web frames Using the view settings Default display you see the guide plane Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 13

Part 2 Outer hull, regular part one quadrant Insert a polycurve as follows (one half of the pontoon will be modelled initially) Guiding Geometry Free-Form Curve Poly Curve and define the positions as shown below Notice you need to click in between curvature to guide the tangential This curve will be used to extrude the hull form 4 3 2 2nd point 1 Start polycurve 5 6 7 8 9 10 Double click to end polycurve Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 14

Part 2 Outer hull, regular part one quadrant Make the outer hull by a extrude operation. Select the polycurve and select the command Structure Free Form Shells Sweep Curves Dialog The name of the curve is already defined (since it was selected) Specify the length and direction of the extrusion» -40m in x-direction The outer hull for one half of the column width is now created Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 15

Part 3 Outer hull, transition one quadrant Copy the guide plane to new positions for reference when creating the transition zone between curved corners and quadratic hull shape. Select the guide plane, right click and select Copy Translate» The vector is found by clicking between start and stop positions of the copy vector 2 Click end of copy vector 1 Click start of copy vector Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 16

Part 3 Outer hull, transition one quadrant Copy the new guide plane 2.5 meters in negative x-direction. Select the guide curve, right click and select Copy Translate and type in vector -2.5m 0m 0m Change the surface normal of the plate by selecting the plate, right click and choose Flip Normal Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 17

Part 3 Outer hull, transition one quadrant Make a model curve and guide lines to refer to when creating the transition part between curved corner hull and quadratic corner hull. Use command Guiding Geometry Curves on Surfaces Model Curve and click point 1 and 2» First zoom in on model as shown 2 1 Click end of model curve Click start of model curve Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 18

Part 3 Outer hull, transition one quadrant Insert two guidelines to use when creating the curved transition. Use command Insert Guiding Geometry Lines Guide Line Dialog 2 End line 1 Start line Repeat the operation by inserting a new guide line (Curve4) as shown Make the transition zone by selecting all three curves (the model curve and the two guidelines), click right mouse button and select Cover Curves Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 19

Part 3 Outer hull, transition one quadrant Copy the curved shell to the bottom part using a mirror copy. Select the plate, right click and choose Copy Mirror.» The mirror position is found by clicking on point 1 while the direction is found from clicking the vector from point 2 to point 3. 2 Start vector 1 Mirror point 3 Start vector Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 20

Part 3 Outer hull, transition one quadrant Make the remaining part of the transition zone by inserting regular flat plates. Use command Structure Flat Plate Flat Plate Dialog Click on the four points as shown below 4th corner 4 3 3nd corner 1 1st corner 2 2nd corner Use same technique to insert the remaining plates as shown Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 21

Part 4 Outer hull, fore part one quadrant Make the fore part by using a skin curve technique Copy the guideplane using Copy Rotate as shown (select the guide plane and right click to access the command)» rotation point 1» vector between point 2 and point 3» specify angle 90 degrees 1 3 Rotation point End vector 2 Start vector Insert a guide arc by command Guiding Geometry Conic Section Elliptic Arc from Center and Two Points by clicking at the three points as shown 3 End arc 1 Rotation point 2 Start arc Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 22

Part 4 Outer hull, fore part one quadrant Insert two more guidelines as shown and copy all three down to the bottom part of the pontoon: Select the three upper curves, right click and choose Cover Curves Repeat the same process for the lower three curves Select the plate, right click and choose Flip Normal Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 23

Part 4 Outer hull, fore part one quadrant Finally make the vertical hull part by skinning between the lower and upper arc guide. Use command Structure Curved Shell Skin/Loft Curves» First click the bottom curve, then double click the upper curve Select the new curved plate, right click and flip the normal Seen from outside Seen from inside Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 24

Part 5 Web frames Two different types of web frames will be made, one watertight and one open. The watertight will be made using a top down modelling approach while the open will be made using a bottom-up approach. Change default thickness property to Pl12. Insert a flat plate as shown (at x=0) Select the plate, right click and choose Divide Select the superfluous parts and delete them to trim the plate to the outer hull. Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 25

Part 5 Web frames Copy the guideplane to the next frame position at x=-5m. Define the guide lines as shown on the new guide plane and insert plates for each part (either from insert plate or cover curve operation) Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 26

Part 5 Web frames Select the corner plates (Pl14 and Pl18), right click and select divide. Then delete the superfluous parts to trim to hull shape. Finally, select all plates in the plane, right click and choose Join. The 6 plates is now joined to one plate Two different web-frames in place Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 27

Part 5 Web frames Copy the web frames as follows. Select the watertight and copy to x-values -10m, -22.5m -30m, -37.5m, -40m The plate at x=-47.5 m has been made from inserting a regular flat plate, selecting it, right click, choose divide and delete the parts that are outside the hull to trim it. Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 28

Part 5 Web frames Select the non-watertight and copy to x-values as shown: You may verify the plate thicknesses by To go back to normal modelling view, click the paintbrush Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 29

Part 6 The column One quarter of the column will be modelled. The other parts will be a copy of the first quarter. Start by making guidelines for references when making the plates. Use command Insert Guiding Geometry Guide Line Dialog» Click first in End 1 input field and then on the model as indicated to find the coordinates» Do the same for End2 and subtract 7.5 meters in y-direction Select the new guideline and copy rotate as follows Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 30

Part 6 The column Select the guidelines and copy upwards 1 meter and 4 meters Copy the upper guidelines 2.5 meters in x and y direction so that: Select the outer upper curves, right click, select divide and then delete the highlighted lines: Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 31

Part 6 The column Insert a circle curve as follows using command Guiding Geometry Conic Section Elliptic Arc from Center. Select the curve, right click and choose Divide. Use parameter 0.5, i.e. divide in 2 equal parts. 3 End arc 2 Start arc 1 Rotation point Insert guidelines as follows: Insert the vertical guidelines at the edges as shown: Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 32

Part 6 The column Change default plate thickness to Pl30 Insert the vertical plates as shown using Structure Curved Shell Skin/Loft Curves Select the curves as shown, right click and choose Cover Curves» Repeat the process for the right curved part Finally, insert plates for the remaining vertical parts using Structure Flat Plates Cover Curves Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 33

Part 6 The column Create the upper part of the column by an extrude command 10 meters in vertical z- direction. Select the curves as shown, right click and select Sweep Curves» You need to flip the normal on some of the plates to orient them with the plate normal outwards Seen from outside Seen from inside Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 34

Part 6 The column Insert a deck level at elevation +22m» Copy the guidelines as shown upwards 12 meters» Insert new guidelines to form a quadrant» Change plate thickness to Pl12» Insert a plate at elevation +22m, select it, choose divide and then delete the parts outside the column such that it is trimmed to the column surface Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 35

Part 6 The column Define an opening in the deck level +22m» Start by selecting guideline as shown and divide with length 5.5 meters the inner part becomes 2 meters» Copy this line and insert a new in between so that a quadrant is formed» Use Circular Fillet Curves like shown below, click on the highlighted lines and specify radius 1.0 Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 36

Part 6 The column» Finally, select the plate, right click, choose divide and click on the curve (it becomes orange in colour) to divide the plate.» Select the inner part and delete it» Select all parts above pontoon level and copy mirror like shown below Seen from outside Seen from inside Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 37

Part 7 Pontoon stiffeners Stiffeners will be inserted at bottom, side and top of the pontoon Make sure you have section profile Tbar885x200x14x35 as default Insert one beam as follows using command Insert Beam Straight Beam 2 1 End beam Start beam Flush the beam to inside of the bottom pontoon plate: Select the beam, right click, choose Edit Beam and select Offset Vector. Click Flush to bottom Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 38

Part 7 Pontoon stiffeners To check that the beam is connected to the plate, you may doubleclick the plate beneath the beam. The display will now show the topology of the model this means that the connection line between the plate and the beam is shown. In the picture below the connection line is selected for better visibility Doubleclick the plate again, to get back to normal modelling view. Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 39

Part 7 Pontoon stiffeners Copy the stiffener to locations as shown: (the fore part of the pontoon depicted) Select all the three beams, right click and choose divide. Delete the stiffener parts outside the fore part of the pontoon hull. The stiffeners are now trimmed to the hull surface. Change the section default to Tbar575x150x12x25 and insert stiffeners at the top deck using the same approach as above. Notice that you need to rotate the first stiffener as shown before you do flushing to bottom (select beam, right click, Edit Beam and Local system) The stiffener is rotated Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 40

Part 7 Pontoon stiffeners Stiffeners are now in place for bottom and top part of pontoon (plates are removed for visibility) Change default section to Tbar425x120x12x25 and insert one beam as follows: 2 End beam 1 Start beam Rotate and flush the beam so that (rotate 90 degrees around local x-axis and flush to bottom) (plates are removed for visibility) Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 41

Part 7 Pontoon stiffeners Copy the stiffener to the positions shown below Insert horizontal stiffeners in the fore part (only the fore part is shown in the following) Copy the selected guideline downwards to new position Select the new guideline, right click and select Create Beam Select the beam, right click and rotate 90 degrees around local x-axis Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 42

Part 7 Pontoon stiffeners Flush the stiffener to the plate Select the stiffener, right click, Edit Beam, Offset vector and choose Flush Bottom Copy the stiffener to positions The structure now looks like the illustration to the right (some plates removed for visibility) Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 43

Part 8 Web frame stiffeners Insert stiffeners as shown on the watertight web frames. Start with one beam, orientate correctly (+90 degrees around local x-axis) and flush to the side of the plate. Use profile Tbar425x120x12x25 Insert eccentricities at both end of beams so that it flushes with bottom and top longitudinal stiffeners. The eccentricities equal (web height + flange thickness) of long. stiffener. Eccentricity from flush to plate Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 44

Part 8 Web frame stiffeners Insert a vertical eccentricity at the top part as shown (vertical down -0.6m and 0.6)» Remember the eccentricity from plate flush) Copy the vertical stiffener to positions as depicted (first to web frame, select all three and copy to all watertight web frames): Some watertight web frames removed for visibility Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 45

Part 8 Web frame stiffeners Finally copy the vertical stiffeners to last watertight web frame using a copy mirror operation: Notice that local axis is flipped when mirroring hence no need for manual rotation The watertight web frames have now vertical stiffeners: Copy to this position also Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 46

Part 8 Web frame stiffeners Copy one of the vertical stiffeners at the web frame to fore outer hull as shown: Copy the stiffener (plates removed for visbility) Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 47

Part 9 Longitudinal web frame Set default thickness to Pl15. Insert a flat plate covering the length of the pontoon (Structure Flat Plates Flat Plate): 3 4 4 th point 2 3rd point 2nd point 1st point Insert longitudinal stiffeners accordingly Use profile Tbar425x120x12x25 1 Rotate around local x-axis 90 degrees and flush on this side of plate (flush bottom) Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 48

Part 10 Make named sets Named sets are created from selecting objects, right click and choose Named Sets Select all structure from view setting Modelling-Structure Rubberband select as follows Right click and choose Named Sets Give the name One_eight_pontoon Select the longitudinal web frame including the stiffeners and give it set name Longitudinal_web_frame The named sets are now available from the browser Click a set to access commands for visibility Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 49

Part 10 Make named sets Continue to make sets: Set name: Stiffeners Hint: Open browser Property -> Sections, then select all properties, right click and choose Select Objects Set name: Half_column Set name: Web_frames Includes stiffeners and plates Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 50

Part 10 Make named sets Set name: Outer_hull Includes stiffeners and plates You may create additional set names. Modelling and results viewing become more efficient when referring to named sets. Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 51

Part 11 Make a proper mesh of the 1/8 pontoon Use default mesh density 2.5 meters (i.e. 2 elements between each stiffener) From browser, right click in mesh pane window select New Mesh Property Define a new mesh property Md_def and specify 2.5 meters as max mesh size Right click the Md_def and choose Set Default Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 52

Part 11 Make a proper mesh of the 1/8 pontoon Create a finite element mesh from Tools Analysis Create Mesh (or use short command ALT+M) Change the display setting to Mesh All to see the finite element mesh The mesh is here seen with a shrink factor as defined under View Options Annotation/Diagrams Set the Shrunken Mesh Factor to 0.9 In the following is described how to ensure a proper finite element distribution from the bottom of the column and upwards: From browser Set, choose Half_column and short command ALT+S (Show selection only) to focus this part only This part needs mesh control Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 53

Part 11 Make a proper mesh of the 1/8 pontoon Change to view Modelling-structure and insert a feature edge as follows Make sure the filter feature Edge is activated! Insert from command Structure Feature Edge 2 End edge 1 Select the Feature Edge, right click, select Properties and choose Mesh Property Make a mesh property that ensures 6 equal elements along a line and apply to the feature edge Start edge Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 54

Part 11 Make a proper mesh of the 1/8 pontoon Copy the feature edge (now including the mesh line setting) to the following positions: Make a new mesh (ALT+M), the mesh is now regular in the lower part as desired Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 55

Part 12 Make ¼ pontoon Select all structure, remove the set Longitudinal-web_frame and remember to include the feature edges and mirror as follows (shown with preview): If you copy with the longituinal_web_frame you will see some warnings, but the copy operation is succesful (GeniE will not copy over existing structure) Select all new structure and give it a set name Quart_pontoon Make a new mesh (ALT+M) Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 56

Part 13 Boundary conditions Select the guide line as shown, right click and choose Create Support Curve Depending on what type of analysis you want to perform you decide the boundary conditions by right clicking the support curve and change the conditions from Properties (typically fixed, free, supernodes) Select the support curve an mirror to the other half of the pontoon. Boundary conditions in place Shown here: Fixed, Fixed, Fixed, Free, Free, Free (plates removed for visbility) Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 57

Part 14 Make ½ pontoon Select all structure remember to include the feature edges and copy using copy mirror as shown You should not include the boundary conditions in the copy operation Make a new mesh (ALT+M) Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 58

Part 15 Make complete pontoons Select all structure and copy 60m in positive y-direction. Finally, insert bracings between the pontoons as shown: Use section property Brace Select the two braces, right click and include in named set Pontoons Sesam User Manual GeniE - Semi Pontoon Workshop www.dnvgl.com/software Page 59